Sanyo Transworld 18h - 815 - UK Vintage Radio Repair and Restoration Discussion Forum

transistor · 23rd Mar 2017, 10:54 pm

Hi everyone,

I'm looking for a Volume pot for this radio. The on off switch is broken. I opened it up and there's a piece of plastic that's broken that hits off of the switch.

I must say that this is a really nice Radio and performs brilliantly on all bands, however I noticed that while scanning through the SW bands it picks up some distorted FM signals, what would cause this ?

The pot is 50 k.

Nuvistor · 23rd Mar 2017, 11:05 pm

Have you a photo of the pot, I cannot help but a photo may help someone identify it.
Are those distorted FM signal from the Broadcast VHF FM band 2? If they are it could be harmonics of the local osc beating with the FM signal. Possibly a number reasons could cause it.
Frank

transistor · 24th Mar 2017, 12:28 am

Unfortunately, I only took these photos with half of it missing......

It's splined at the end.

transistor · 24th Mar 2017, 1:08 am

I should add "missing" is after I took it apart.

transistor · 24th Mar 2017, 1:10 am

Quote:

Originally Posted by Nuvistor

Are those distorted FM signal from the Broadcast VHF FM band 2? If they are it could be harmonics of the local osc beating with the FM signal. Possibly a number reasons could cause it.
Frank

As far as I can tell the FM signal appears to be broadcast FM.

Edward Huggins · 24th Mar 2017, 9:44 am

Sometimes the switch in the rear of the pot can be repaired. You may be able to source/google a 50K pot (check whether it's logarithmic or linear) but it may be more difficult to source one with an on/off switch. Save it in case you can't - you could fit a neat in-line switch in the mains lead.

'LIVEWIRE?' · 24th Mar 2017, 10:12 am

If that is a standard pot. with a splined shaft, Cricklewood Electronics and several eBay sellers list similar types, usually 16mm diameter types in a wide range of log. and linear values, but whether any stock ones with a switch I'm not certain.

transistor · 24th Mar 2017, 10:38 pm

Thanks for the replies lads.

I don't know how to find out whether it's log or linear ?

Nuvistor · 24th Mar 2017, 10:43 pm

If you have a meter, test it with the one of the ohms range, a linear pot will read 25k from either end with the pot in the middle of its travel, a log pot will not.
It's probably a log type with it being the volume control.
Frank

transistor · 25th Mar 2017, 12:43 am

Thanks Frank, I hope to work on it more next week.

23rd Mar 2017, 10:54 pm	#1
transistor Tetrode Join Date: Apr 2016 Location: Kildare, County Kildare, Ireland Posts: 61	Sanyo Transworld 18h - 815 Hi everyone, I'm looking for a Volume pot for this radio. The on off switch is broken. I opened it up and there's a piece of plastic that's broken that hits off of the switch. I must say that this is a really nice Radio and performs brilliantly on all bands, however I noticed that while scanning through the SW bands it picks up some distorted FM signals, what would cause this ? The pot is 50 k.

23rd Mar 2017, 11:05 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Sanyo Transworld 18h - 815 Have you a photo of the pot, I cannot help but a photo may help someone identify it. Are those distorted FM signal from the Broadcast VHF FM band 2? If they are it could be harmonics of the local osc beating with the FM signal. Possibly a number reasons could cause it. Frank

24th Mar 2017, 12:28 am	#3
transistor Tetrode Join Date: Apr 2016 Location: Kildare, County Kildare, Ireland Posts: 61	Re: Sanyo Transworld 18h - 815 Unfortunately, I only took these photos with half of it missing...... It's splined at the end. Attached Thumbnails

24th Mar 2017, 1:08 am	#4
transistor Tetrode Join Date: Apr 2016 Location: Kildare, County Kildare, Ireland Posts: 61	Re: Sanyo Transworld 18h - 815 I should add "missing" is after I took it apart.

24th Mar 2017, 9:44 am	#6
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,328	Re: Sanyo Transworld 18h - 815 Sometimes the switch in the rear of the pot can be repaired. You may be able to source/google a 50K pot (check whether it's logarithmic or linear) but it may be more difficult to source one with an on/off switch. Save it in case you can't - you could fit a neat in-line switch in the mains lead. __________________ Edward.

24th Mar 2017, 10:12 am	#7
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Sanyo Transworld 18h - 815 If that is a standard pot. with a splined shaft, Cricklewood Electronics and several eBay sellers list similar types, usually 16mm diameter types in a wide range of log. and linear values, but whether any stock ones with a switch I'm not certain.

24th Mar 2017, 10:38 pm	#8
transistor Tetrode Join Date: Apr 2016 Location: Kildare, County Kildare, Ireland Posts: 61	Re: Sanyo Transworld 18h - 815 Thanks for the replies lads. I don't know how to find out whether it's log or linear ?

24th Mar 2017, 10:43 pm	#9
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Sanyo Transworld 18h - 815 If you have a meter, test it with the one of the ohms range, a linear pot will read 25k from either end with the pot in the middle of its travel, a log pot will not. It's probably a log type with it being the volume control. Frank

25th Mar 2017, 12:43 am	#10
transistor Tetrode Join Date: Apr 2016 Location: Kildare, County Kildare, Ireland Posts: 61	Re: Sanyo Transworld 18h - 815 Thanks Frank, I hope to work on it more next week.